How to store the method parameter values directly to the array list and then pass it to the another method

Question

Following is the workflow:

Class A{

    B obj_b = new B;

    String x= "abc";
    String y= "def";

    public void method_a(){
        obj_b.method_b(x,y);
    }  
}

Class B{

    C obj_c = new C;
    public String method_b(String Fname, String Lname){

        ArrayList<String> names = new ArrayList<String>();
        names.add(Fname);
        names.add(Lname);

        String qwerty=("Hello"+ obj_c.method_c(names));

    }
}

Class C{

    public String method_c(ArrayList<String> allElements){
        String xyz = MessageFormat.format(allElements.get(0),allElements.get(1));
        return xyz;
    }
}

What I want to do is:

In Class B, to add all the arguments directly to the ArrayList(i.e. Fname and Lname to names array list). Number of arguments may vary.There might be some other method calling method_b() with 3 or 4 arguments, that is why I am using ArrayList.
Then in Class C, putting each element of the array list(i.e. names) in the method,message(),with comma separated.

Please suggest if any better approach can be taken.

al.add(Fname); -- what is al? Please post code that can be compiled, this is not valid Java code as al is not declared anywhere. — Jim Garrison
– Jim Garrison, Commented Dec 18, 2017 at 19:52
Your method_c is ignoring all but the first 2 elements in the ArrayList. — D M
– D M, Commented Dec 18, 2017 at 20:01
@DM-Yes! this is what I want to know. Right now I know that I have two arguments so I hard coded it. But what if there are many. How to do that?How to put all the elements separated by a comma. — D Bhatnagar
– D Bhatnagar, Commented Dec 18, 2017 at 20:05

Ele · Accepted Answer · 2017-12-18 20:14:41Z

1

I think you need something like this:

class B {
    C obj_c = new C();

    public void method_b(String... args) {
        List<String> names = Arrays.asList(args);
        String qwerty = "Hello " + obj_c.method_c(names);
    }
}

That way, you can send unlimited args to method_b.

Hope this helps!

answered Dec 18, 2017 at 20:14

Ele

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